Macy and Miles time travel to the past to retrieve William Murdoch's pocket watch, while Billie and Zane get sidelined and become suspicious of Miles, causing a major rift between the friends.

After a major fight with Billie and Zane, Macy asks Miles to accompany her to an abandoned jail where, unbeknownst to her, her killer lies in wait. Billie and Zane investigate the killer's note.

Reunited, the trio takes on the final clue which leads them to a nearby woodshop, where they find Miles talking to a mysterious man. They must find out who Miles really is and who he's working with.